public BitmapRenderer(IntPtr dibHandle)
{
_dibHandle = dibHandle;
_bitmapPointer = Kernel32Native.GlobalLock(dibHandle);
BitmapInfoHeader bitmapInfo = new BitmapInfoHeader();
Marshal.PtrToStructure(_bitmapPointer, bitmapInfo);
log.Debug(bitmapInfo.ToString());
_rectangle = new Rectangle();
_rectangle.X = _rectangle.Y = 0;
_rectangle.Width = bitmapInfo.Width;
_rectangle.Height = bitmapInfo.Height;
if (bitmapInfo.SizeImage == 0)
{
bitmapInfo.SizeImage = ((((bitmapInfo.Width * bitmapInfo.BitCount) + 31) & ~31) >> 3) * bitmapInfo.Height;
}
// The following code only works on x86
Debug.Assert(Marshal.SizeOf(typeof(IntPtr)) == 4);
int pixelInfoPointer = bitmapInfo.ClrUsed;
if ((pixelInfoPointer == 0) && (bitmapInfo.BitCount <= 8))
{
pixelInfoPointer = 1 << bitmapInfo.BitCount;
}
pixelInfoPointer = (pixelInfoPointer * 4) + bitmapInfo.Size + _bitmapPointer.ToInt32();
_pixelInfoPointer = new IntPtr(pixelInfoPointer);
}
public static Bitmap NewBitmapFromHBitmap(IntPtr dibHandle)
{
IntPtr _bitmapPointer;
IntPtr _pixelInfoPointer;
Rectangle _rectangle;
BitmapInfoHeader _bitmapInfo;
Bitmap bitmap;
_bitmapPointer = Kernel32Native.GlobalLock(dibHandle);
try {
_bitmapInfo = new BitmapInfoHeader();
Marshal.PtrToStructure(_bitmapPointer, _bitmapInfo);
log.Debug(_bitmapInfo.ToString());
_rectangle = new Rectangle();
_rectangle.X = _rectangle.Y = 0;
_rectangle.Width = _bitmapInfo.Width;
_rectangle.Height = _bitmapInfo.Height;
if (_bitmapInfo.SizeImage == 0)
{
_bitmapInfo.SizeImage = ((((_bitmapInfo.Width * _bitmapInfo.BitCount) + 31) & ~31) >> 3) * _bitmapInfo.Height;
}
// compute the offset to the pixel info, which follows the bitmap info header
{
// The following code only works on x86
Debug.Assert(Marshal.SizeOf(typeof(IntPtr)) == 4);
int pixelInfoPointer = _bitmapInfo.ClrUsed;
if ((pixelInfoPointer == 0) && (_bitmapInfo.BitCount <= 8))
{
pixelInfoPointer = 1 << _bitmapInfo.BitCount;
}
pixelInfoPointer = (pixelInfoPointer * 4) + _bitmapInfo.Size + _bitmapPointer.ToInt32();
_pixelInfoPointer = new IntPtr(pixelInfoPointer);
}
// render to bitmap
bitmap = new Bitmap(_rectangle.Width, _rectangle.Height);
using (Graphics graphics = Graphics.FromImage(bitmap)) {
IntPtr hdc = graphics.GetHdc();
try {
Gdi32Native.SetDIBitsToDevice(hdc, 0, 0, _rectangle.Width, _rectangle.Height,
0, 0, 0, _rectangle.Height, _pixelInfoPointer, _bitmapPointer, 0);
}
finally {
graphics.ReleaseHdc(hdc);
}
}
bitmap.SetResolution(PpmToDpi(_bitmapInfo.XPelsPerMeter), PpmToDpi(_bitmapInfo.YPelsPerMeter));
} finally {
Kernel32Native.GlobalUnlock(dibHandle);
}
return(bitmap);
}
protected virtual void Dispose(bool disposing)
{
Kernel32Native.GlobalUnlock(_dibHandle);
}
